/Engine/Source/Editor/UnrealEd/Public/EditorViewportLayoutTwoPanes.h
FEditorViewportLayoutTwoPanesHoriz/////////////////////////////.
class FEditorViewportLayoutTwoPanesHoriz : public [TEditorViewportLayoutTwoPanes< EOrientation::Orient_Horizontal >](API\Editor\UnrealEd\TEditorViewportLayoutTwoPanes)